Document Detail

Resistance to apoptosis in CTLL-2 cells overexpressing B-Myb is associated with B-Myb-dependent bcl-2 induction.
MedLine Citation:
PMID:  10344757     Owner:  NLM     Status:  MEDLINE    
Transcriptional regulators of the Myb family play important roles in cell proliferation, differentiation, and survival. To investigate the role of Myb proteins in the regulation of apoptosis, we studied the apoptotic response of interleukin 2-dependent CTLL-2 cells stably transfected with B-Myb. B-Myb-overexpressing cells showed a diminished cytokine dependence and were resistant to apoptosis induced by doxorubicin, ceramide, and dexamethasone. Overexpression of B-Myb was associated with enhanced expression of bcl-2, which was dependent, at least in part, on increased transcription. In transient transfection assays in T-lymphoblastic cells, B-Myb was able to stimulate the promoter activity of the bcl-2 5' flanking region linked to the chloramphenicol acetyltransferase reporter gene. A segment of the bcl-2 promoter (nucleotides +34 to +58 relative to the transcription initiation site) contained a putative Myb-binding site and was shown to specifically interact with B-Myb and to confer B-Myb responsiveness to a bcl-2/chloramphenicol acetyltransferase reporter construct. These results indicate that B-Myb promotes T cells survival by enhancing the expression of bcl-2 and identify bcl-2 as a B-Myb target gene regulated in a DNA binding-dependent manner.
E Grassilli; P Salomoni; D Perrotti; C Franceschi; B Calabretta
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't; Research Support, U.S. Gov't, P.H.S.    
Journal Detail:
Title:  Cancer research     Volume:  59     ISSN:  0008-5472     ISO Abbreviation:  Cancer Res.     Publication Date:  1999 May 
Date Detail:
Created Date:  1999-06-17     Completed Date:  1999-06-17     Revised Date:  2008-11-21    
Medline Journal Info:
Nlm Unique ID:  2984705R     Medline TA:  Cancer Res     Country:  UNITED STATES    
Other Details:
Languages:  eng     Pagination:  2451-6     Citation Subset:  IM    
Department of Microbiology and Immunology and Kimmel Cancer Center, Thomas Jefferson University, Philadelphia, Pennsylvania 19107, USA.
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MeSH Terms
Apoptosis / drug effects*
Cell Cycle Proteins*
Ceramides / pharmacology*
Chloramphenicol O-Acetyltransferase / biosynthesis,  genetics
DNA-Binding Proteins / physiology*
Dexamethasone / pharmacology*
Doxorubicin / pharmacology*
Gene Expression Regulation*
Genes, Reporter
Genes, bcl-2*
Promoter Regions, Genetic
Proto-Oncogene Proteins c-bcl-2 / biosynthesis*
Recombinant Fusion Proteins / biosynthesis
Regulatory Sequences, Nucleic Acid
T-Lymphocytes / metabolism
Trans-Activators / physiology*
Transcription, Genetic
Reg. No./Substance:
0/Cell Cycle Proteins; 0/Ceramides; 0/DNA-Binding Proteins; 0/Mybl2 protein, mouse; 0/Proto-Oncogene Proteins c-bcl-2; 0/Recombinant Fusion Proteins; 0/Trans-Activators; 23214-92-8/Doxorubicin; 50-02-2/Dexamethasone; EC O-Acetyltransferase

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